Re: Loadable VM pager
From: Robert Watson (rwatson_at_FreeBSD.ORG)
Date: 08/23/03
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Date: Sat, 23 Aug 2003 10:54:18 -0400 (EDT) To: David Schultz <das@FreeBSD.ORG>
On Sat, 23 Aug 2003, David Schultz wrote:
> On Sat, Aug 16, 2003, Nicolas Souchu wrote:
> > I'm wondering if being able to load dynamically a pager in FreeBSD VM
> > would be worth and even possible with kobj. Of course that would
> > introduce some overhead to the page fault handling...
>
> Presently, the VM code has a number of special cases based on pager
> type, and this organization does not lend itself well to object-oriented
> techniques. At a minimum, those cases would have to be fixed, with
> consideration to the performance consequences. It's an interesting
> idea, nonetheless...
It would be nice if we could easily support research into DSM, etc, using
VM pagers. This is one of the research-nice things that we lost in the
transition of the code from Mach (or maybe we got the code before Mach was
really into that sort of thing, don't know). I agree that one of the key
issues will be avoiding slowing the fast path...
Robert N M Watson FreeBSD Core Team, TrustedBSD Projects
robert@fledge.watson.org Network Associates Laboratories
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